This actually made me laugh!
I have seen what I'm certain is a ghost, and heard one, too.
Staying at a young person's hostel, my own room, on my first night there {I lived there for over a year} ..I in bed, and an elderly man walked in, I thought ''He's in the wrong room...then ''If you weren't so solid, I'd think you were a ghost''...I could see his silhouette, wearing a trilby and overcoat, he was looking around, then down at me..I was looking at him through half closed eyes. I couldn't see his face.He didn't appear threatening, he seemed perplexed.
Next morning, in reception, 'I asked who the man was who'd come into my room.
They said ''no one has been through into your room, there has been someone on duty here all night, there are no older men here, only Eric, and he's away..{When I saw Eric, a few days later, it definitely wasn't him.}
I never saw the man again.
I had to put a date on his clothing, 1940's?